Ask unlimited questions for free
The human body produces and destroys 15 million blood cells every second.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
There are more nerve cells in one human brain than there are stars in the Milky Way.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Green tea is able to stop the scent of garlic or onion from causing bad breath.
For a complete list of videos, visit our video library